It all depends on the other dimensions of the suitcase and also of the trunk. To illustrate this I am going to use some unlikely dimensions. But they should show that you cannot give a proper answer with only partial information.
Suppose the 22" suitcase has a height of 8 inches.
Suppose the 9 cubic foot trunk has dimensions 36 feet*6inches*6inches ie a long narrow trunk. Then you will not get even a single suitcase in.
0.116 pounds per cubic inch
10 cubic feet
4.5 cubic foot=7776 cubic inch
It is 7.83 gallons per inch. .785x4x4x1=12.56 cubic feet. 12.56 cubic feet x 7.48 gallons per cubic foot=93.9 gallons per foot 93.9 gallons per foot / 12 inches per foot =7.83 gallons per inch.
How many cubic yards in an 12 foot diameter circle with a 4 inch thickness?
Cubic inch is 1 inch x 1 inch x 1 inch There are 12 inches in a foot, so 1 cubic foot = 12 x 12 x 12 = 1728 cubic inches. Hence a cubic foot is 1728 times bigger than a cubic inch
square feet
1 foot = 12 inch 1 cubic foot = 12 x 12 x 12 cubic inch = 1728 cubic inch 231 cubic inch = 231/1728 cubic feet = 0.134 cubic feet
2000 cubic foot = 2000 (cubic foot) x 1728 (cubic inch/cubic foot) x 16.387 (cubic cm/cubic inch)x1/1000000(cubic meter/cubic cm) = 56.6337 cubic meter from the above answer we get: 25 cubic meters = 882.867 cubic foot
0.116 pounds per cubic inch
A cubic foot measures 12 inch x 12 inch x 12 inch (LxWxH) Therefore there are 12x12x12 = 1728 cubic inch in each cubic foot.
1 cubic foot = 1,728 cubic inches
1 foot = 12 inch 0.15 cubic feet = 0.15 x 123 cubic inch = 259.2 cubic inch
10 cubic feet
4.5 cubic foot=7776 cubic inch
Those are incompatible units. Pounds per square foot is pressure. Pounds per cubic foot is density. It is like converting gallons to inches.
It is 7.83 gallons per inch. .785x4x4x1=12.56 cubic feet. 12.56 cubic feet x 7.48 gallons per cubic foot=93.9 gallons per foot 93.9 gallons per foot / 12 inches per foot =7.83 gallons per inch.